South Australian Consolidated Regulations

ROAD TRAFFIC (VEHICLE STANDARDS) RULES 1999 - REG 148

148—Exhaust systems

        (1)         The outlet of the exhaust system fitted to a motor vehicle (except a bus) must extend:

            (a)         behind the back seat; and

            (b)         at least 40 millimetres beyond the outermost joint of the floorpan that is not continuously welded or permanently sealed; and

            (c)         to the edge of the vehicle, if:

                  (i)         the body of the vehicle is permanently enclosed; and

                  (ii)         the vehicle is not fitted with a vertical exhaust system; and

            (d)         no further than the edge of the vehicle at its widest point.

        (2)         The outlet must discharge the main exhaust flow to the air:

            (a)         if the vehicle is fitted, or required under a law of this jurisdiction to be fitted, with an exhaust system with a vertical outlet pipe:

                  (i)         at an angle above the horizontal; and

                  (ii)         at least 150 millimetres above the cab of the vehicle; and

                  (iii)         rearwards or to the right of the vehicle; and

            (b)         in any other case:

                  (i)         horizontally or at an angle of not over 45° downwards; and

                  (ii)         under 750 millimetres above ground level; and

                  (iii)         rearwards or to the right of the vehicle.

        (3)         An exposed section of a vertical exhaust system fitted to a motor vehicle (except a bus) with a GVM over 4.5 tonnes must be positioned or shielded to prevent injury.

        (4)         The outlet of the exhaust system fitted to a bus with a GVM over 4.5 tonnes must:

            (a)         be as near as practicable to the rear of the vehicle; and

            (b)         extend no further than the edge of the bus at its widest point.

        (5)         The outlet must discharge the main exhaust flow to the air:

            (a)         if the bus is fitted, or required under a law of this jurisdiction to be fitted, with an exhaust system with a vertical outlet pipe:

                  (i)         behind the passenger compartment; and

                  (ii)         at an angle above the horizontal; and

                  (iii)         upwards or rearwards; and

            (b)         in any other case:

                  (i)         horizontally or at an angle of not over 45° downwards; and

                  (ii)         rearwards or to the right of the vehicle.

        (6)         A vertical exhaust system fitted to a motor vehicle with a GVM over 4.5 tonnes must:

            (a)         if the vehicle is fitted with an exhaust system with a vertical outlet pipe that does not direct the main exhaust flow straight up—direct the flow rearwards at an angle within 0° to 45° of the longitudinal centre line of the vehicle; and

            (b)         if a rain cap is fitted to the outlet pipe—be installed so the hinge of the cap is at an angle of 90° (plus or minus 10°) to the longitudinal centre line of the vehicle when viewed from above.

Bus exhaust outlet pipe